HARD
12th ICSE
IMPORTANT
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A parallel light beam of wavelength 6000 Å passes through a slit 0.2 mm wide and forms a diffraction pattern on a screen 1.0 m away from the slit. Find the width of the central maximum on the screen. What would be the width of this maximum, if the apparatus be immersed in water of refractive index 43?

Important Questions on Diffraction of Light

EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 2
What should be the order of the size of obstacle/aperture for observing diffraction of light?
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 1
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygens' wavelet from the edge of the slit and the wavelet from the mid-point of the slit is:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
A beam of light of λ=600 nm from a distant source falls on a single-slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is:
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width e is of the wavelength of light. If D is the distance of the screen from the slit, the width of the central maxima will be:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of light of wavelength 5×10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 7
In a diffraction pattern due to a single slit of width e, the first minimum is observed at an angle 30° when light of wavelength 5000 Ao is incident on the slit. The first secondary is observed at an angle of:
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 8
The box of a pin hole camera of length L has a hole of radius e. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ, the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say bmin) when:
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12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 9
The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 μm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? (i.e., distance between the centres of each slit.)